#homebtn{
  height:48px;
  max-width: 640px;
  min-width: 320px;
  width: 100%;
  position: fixed;
  bottom: 0;
  background: $white;
  display: flex;
  border-top: 1px solid #979797;
  z-index: 100000;
  a.item{
    flex: 1;
    -webkit-flex: 1;
    height: 100%;
  }
  @each $bg,$index in ('../images/icon_1.png',1),
          ('../images/icon_2.png',2),
          ('../images/icon_3.png',3),
          ('../images/icon_4.png',4){
    .item:nth-child(#{$index}){
      background: url($bg) center center/ auto 36px no-repeat;
    }
  }
  a{

    display: block;
  }
}